Wall shelf



FIG. 1 is a perspective view of a wall shelf showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a first end view thereof, the opposite end being a mirror image of the end shown;

FIG. 4 is a front view thereof; and,

FIG. 5 bottom view thereof. 

The ornamental design for a wall shelf, as shown and described. 